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RE: st: Propensity score matching
From
"KASHEFIPOUR E." <[email protected]>
To
<[email protected]>
Subject
RE: st: Propensity score matching
Date
Thu, 19 Jul 2012 16:37:04 +0100
Hi Areil,
Many thanks for your comments. You mentioned that "comparability is
determined by ensuring that they balance on covariates that are measured
before they start issuing bonds". I am wondering in which year they
could be balanced? My control sample varies between 2007 and 2011 and
the treated sample issue bonds between 2007 and 2011. Thanks for your
help.
Best,
Eilnaz
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Ariel Linden,
DrPH
Sent: 19 July 2012 16:30
To: [email protected]
Subject: re: st: Propensity score matching
The simple answer is that matching is intended to create balance between
treated and controls on pre-intervention covariates.
For your situation (as I understand it), the companies who issue bonds
should be comparable to those firms who do not issue bonds. Here
comparability is determined by ensuring that they balance on covariates
that are measured before they start issuing bonds, since the "issuing of
bonds"
appears to be the intervention.
Your additional comments "both sample varies between 2007 and 2011" and
"how should the dataset look" gives us no meaningful information to help
you. You should think carefully about how you pose a question if you
would like to get a meaningful response.
Ariel
Date: Wed, 18 Jul 2012 19:57:53 +0100
From: "KASHEFIPOUR E." <[email protected]>
Subject: st: Propensity score matching
Hi,
I have a question regarding the PSM estimation. I want to investigate
the companies who issue bonds between 2007 and 2011, so this group would
be as a treatment sample. Then I want to match the treatment group with
a set of companies who do not issue bonds during the observation period
(2007-2011). I was wondering how I could match them as both sample
varies between 2007 and 2011? How should the dataset look like?
Best,
Eln
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